Hemstitch sewing machine



E. GEGAUF. HEIIISTITCH SEWING MACHINE.

APPLICATION FILED IAN. I8, 1922.

Patented Mar. 21;, 1922.

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EUGEN GEGAF, OF STECKBOB-N, SITZERLAND.

HEMSTTCH SEV/"ING MACHINE.

Application le. January 18,1922.

To all whom it may cof/wem Be it known that l, Fincas' GneAUr, a citizenof the Republic opt qwitzerland` residing at Steckborn, in the Canton otThurgan, Republic' of Switzerland,` have invented certain new and usefulTmprovements in Hemstitch Sewing Machines (for `which have tiled anapplication in Switzerland, #10,870, January li', 1921,.) ot which thefollowing is a specilication. Y.

. This invention relatesto improvements in hem-stitch sewing machines,and more particularly, such machines comprising one vor two revolvinghooks or loopers located one behind the other in the direct-ion ot thecloth feed and adapted to be swung;` from an operative or stitchingposition to an inoperative position, convenient for the insertion andremoval'of the spool of under thread. The invention is designed toprovide an improved construction ol such machines wherein even when twoloopers are employed, a feed device can be used and can be properlysupported on each side of the line of the cloth feed.

The accompanying drawings illustrate by way of example an embodiment ofthe invention consisting of an improved machine in which two rockableloopers are employed located one behind the other.

In these drawings:

i rig. i is a 'pian of the improved machine,

atter removal otlthe machine top plate.

. 'l Fig. 2 is a side `elevation of a looper earriei' belonging theretoshown partly in section. For the sake of clearness of the `draw- Fig. 3is a vertical section taken along` theY e line A-B` of Fig. @of a slidefor rocking a loopera l y Fig. Llis a plan of this slide.

Fig.` 5 illustrates'an apparatus for preventing the' spoolcarrierlocated in theL looper casing from moving with the revolvin`looper easing.

Y ig. 6 is a similar view of amodiication. Fig. 7 is a section on theline 7 7 of Fig. 6.

a are the looper carriersV located on opposite sides of their commondriving shaft w extending between them. The axisof this shaft w is atright angles to the airis of Specification of Letters Patent.

a larger scale.

Patented Mar. 2l, lgfz.

Serial No. 530,157.

derside of the said table top in a direction at right angles to thecloth feed, tor the purpose of enabling` the looper to set to differentwidths of hem-stitching. Y

On the lower end of each pin there is rotatably mounted a spur wheel fwhich meshes with a spur wheel f/ for driving the looper casing and isfixed to a helical wheel it. This latter wheel meshes with a helicalwheel a mounted on the shaft w. Therefore, as the shaft rotates thelooper receives its rotary motion throughthe' wheels 2, it, f, ,0. Onlthe other hand, as the looper rocks around the pin l? as-on an axis, thewheelf/ rolls over the wheel f. v The two helical wheels a haveoppositely inclined teeth.

For rockingeach looper an arm Z is employed which is rotatably mountedon the looper shaft bearing l; located on the looper carriera. This armis lined at its tree slotted end,and carries an upwardly extending pin mwhich is adjustable along the slot in the arm, that is to say, isadjustable in a direction radial Vto the axis of the looper. The pin mis provided at itsupper end with an'ztntilriction roller a working; in asuitable recess inthe underside of a slide o movable in the table top e.This slide is located symmetrically to the line of the cloth iteed,which line is ati'ight angle to the axis of the path ot the piercer in aplane extending` at right angle to the aXis ot the shaft w. The axis ofthe pin-ifm, passes throughthe said line.

One slide is withdrawable towards the front, whereas the other-.side iswithdrawable towards the rear,both beyond the longitudinal edge of thetable top e (as indicated in dotand-dashV lines in Fig. l). l

Figs. 3 and l illustrate the slide-0 and the parts serving` to actuatethe same, drawn'on The upper surface o t the slide'is exactly flush withthe upper surfacev of the machine table top e, and iills up completelythe opening provided orit in the said table top, when the looper is inits opervattive position. For the purpose of securing the slide in thisposition .a stem s is employed formed with au upwardly taperingtruncated conical head g ywhich .tits exactly into an aperture providedin the slide o, when the latter is in its normal position. 5 rlhe stem sis slidably mounted in a bearing t which is fixed against the undersideoftheV table top e by means of screws r is a spring located in a recessinthe bearing t; it encircles the stem s between the head g and thebearing t, and presses the head (I against the slice 0. The screws uhave a certain amount of play in vthe bearing t, so ,as to allow ofadjusting the said bearing` relatively to the slide o, in order that thehead g shall fit exactly in the aperture provided for its reception inthe said slide.

When -it is desired to draw out a slide o, forinstance into the positionindicated in dotand-dash lines in the lower partvof Fig. l, for thepurpose. of rocking a looper; the operator presses with his `linger uponthe head Q so as to depress the latter below the slide 0, lwhereupon heis then immediately able to pull out` the slide by means of the samefinger which yremains in the aperture thus opened. By `the pullingout ofoneor the other slide o the corresponding looper carrier a is caused b ythe intermediary of the 4parts 1i, m, Z, 7c, to 4swing outwards aroundthe pin o as a centre. In this moveinent the looper which, for knownreasons, lies somewhat to one side (the one looper to the left, and theother looper to the right) of the line of the cloth feed during `theworking of the machine is thus brought on to the actual line of feed,that. is to say, under the portion (opened 'by the pulling out of theslide) of the opening provided in the machine table top, so that thesaid looper is `thus rendered accessible for the Vpurpose of changingthe spool.

In the pulling out of the slide the looper moves approximately along thesaid line of feed, whilst in its operative position it is situated onthe inner side of a plane passing through the axisof the pin V7)- (thatis, the rocking axis of the looper carrier) at right angles to the lineof feed, .whereas after its rocking movement, it is situated at an equaldistance on the Iouter side of the said plane. Thus, in rocking, theloopers move instantly a .considerable distance away from the planepassing through the axis ofthe path of the pierceratright angles `to thefeedfline (that `iste say, in :thepresent ease, thronghthe axis of theshaft i0). Consequently there 'is plenty ofroom right and left for thelocationuofa suitable feed device-in the space situated between the twolooper casings and immediately and laterallyiof the said space).

`Orrthe' looper shaft bearing 7c of ythelooper :carrier a there ismounted labove lthe `armfl a stop Acollar 1/ for preventing anyfpossibilityi-of the Varm coming in Contact :wit-hi theffast revolvinglooper casing i casing, and are ,thusscontinued 1in a common Fig. 5illustrates an improved device which is designed to prevent the spoolholder y' located in the' looper casing e' from revolving' with thefast-revolving looper casing (which makes 3000 to 4000 revolutions aminute) and is also designed to secure the spool holder in its positionrelatively to the looper carrier even `whilst the said looper carrier isbeing rocked out of its operative position. The said device has theshape of a substantially rectangular frame and consists in a fork a;fixed 'to the bearing k. The two prongs of this fork vare at firstupwards and parallel to `each other some 'dis tance apart, so as toallow a small lportion of the looper casing to proj ect-,between them,after which the said prongs are bent at right angles to themselves sovasto `extend over the said small portion of the looper horizontaldirection towards each other. The free ends of the `prongs bear from4opposite sides against a nose-yprojecting from the spool holder, andthey yserve thereby as a stop or abutment for the said vnose Vandconsequentlyaalso for the spool holder if and when the latterhas atendency to `revolve with the looper casing'. Moreover, this fork allowsofthe removal ofthe sp'oolholder from `the looper casing withoutrequiring any attachingdeviees whatever .to be undone for this purpose.-It is ralso to lherunderstood that the fork may beconstructedto allowof its being adjusted in the angular as -well as in the verticaldirection. In this case a ring 'w1 (Fig. 16) will be adjustably mountedon a downward yextended :part of the bearing 7c and .theforkm fixed on`this ring m1 in a suitable -recess'formed thereon for guidance. i

The constructional exampleas described and illustrated comprises twoloopers. It is however obvious that the improvements of the inventionmaybe applied also-5to -heinstitch sewingV machines having only onelooper.

That I claim is:

1. A henrstitch sewingmaohine comprisinga rocking -arm,.a looper mountedrotatably in said rocking arm, a wheel fixed on the looper axle, a wheellooselymountedon the pivotal axle ofthe rocking uarm forV driv- 'toenable the distance of the looper fromthe line of the cloth feed to bevaried.`

2. A'hemstitch sewing machine compris- 1.25

Ving a carrier-rotatable around a vertical pin fixed in the 'machine topplate, alater'a'l arm on this carrier in which arm the looper is carriedin a rotatablefmanner; affirst spur wheel loose on' said pin=,"meshingwith asec- 13G ond spur wheel fixed on the looper axle; a first helicalwheehrigidly connected with said first spur wheel; and a (second)helical Wheel which meshes with said firsthelical wheel, and is mountedon a shaft extending at right angles to the path of the piercer,parallelly to the main driving shaft of the machine.

3. A hem-stitch sewing machine comprising a rocking arm, a looperrotatable on the rocking arm, and located in front of, or behind thepath of the piercer; a slide slidable in the table top of the machineand flush with the upper surface thereof, said slide being locatedsymmetrically to the centre line of the cloth feed, and movable alongthe line of the cloth feed; and a movable joint connection between saidslide and said rocking arm, allowing the distance between looper andslide to be varied; the relative positions of the pivotal axis of saidrocliin arm, the axis of said looper, said slide, and the path of saidpiercer being such that by pulling out said slide, said looper is movedapproximately along the centre line of the cloth feed, and comes underthe newly exposed portion of the recess provided for the reception ofsaid slide in the machine table top, and a vertical plane passingthrough the pivotal axis of the looper carrier parallelly to the maindriving shaft of the machine, passes approximately midway between theworking position and the swung-out position of said looper.

4l, A hem-stitch sewing machine comprising two loopers, rocking armsrotatably supporting said loopers, said arms having their rocking axleslocated on opposite sides of the centre line of the cloth feed and of avertical plane passing through the path of the piercer parallelly to themain driving shaft of the machine, with a shaft, located in said plane,for operating said loopers, helical wheels, one for each of saidlooper-s, mounted on said operating shaft, meshing with helical wheelsVfixed to spurwheels which latter are loose on said rocking axles andwhich serve for actuating the looperoperating axles.

5. A hem-stitch sewing machine comprising a swingable looper, anupwardly directed forl mounted on the looper carrier, having two prongsextending at right angles, and spaced apart to allow the outer portionof the looper casing to enter between the lower portions of said prongs,whilst the free ends of the latter bear from opposite sides against alaterally projecting nose lo-' cated on the spool holder mounted in saidlooper casing, so as to serve as stops or abutments for said nose andconsequently for said spool holder, and, thereby prevent said spoolholder from being moved by said looper casing, the arrangement beingsuch that the part carrying said nose can be removed at any time withoutany fastening device having to be undone for this purpose.

In testimony whereof I have affixed my signature in presence of twowitnesses.

EUGENE GEGAUF. Witnesses:

O. G. VUILLIEN, AUGUST REGG.

